The question is incomplete. The complete question is as follows:
Use the periodic table to identify the name or atomic number for each element below. (Give the name, not the chemical symbol, for each element.)
hafnium: atomic number
atomic number 15
atomic number 45
osmium: atomic number
magnesium: atomic number
Answer:
hafnium: atomic number - 72
atomic number 15 - Phosphorus
atomic number 45 - Rhodium
osmium: atomic number - 76
magnesium: atomic number - 12
Explanation:
A Periodic table is a tabular representation of elements or atoms arranged on the basis of their atomic number and atomic mass.
So according to the periodic table:
- Hafnium is metal and atomic number of hafnium is 72 that lies in group 4 (IVb) of the periodic table.
- Atomic number 15 in the periodic table represents Phosphorus with the symbol P.
- Atomic number 45 in the periodic table represents Rhodium with symbol Rh.
- Atomic number of osmium is 76 that lies in Group 8 (VIIIB) of the periodic table.
- Atomic number of magnesium is 12 that lies in group 2 (II) of the periodic table.
Hence, the correct answer is:
hafnium: atomic number - 72
atomic number 15 - Phosphorus
atomic number 45 - Rhodium
osmium: atomic number - 76
magnesium: atomic number - 12
